Fixed Pin is coming out with some great guidebooks, in addition to those already mentioned they are coming out with some South Platte books that are pretty amazing. The northern volume is already out and the Southern volume is in the works.

There seems to be a pretty decent guidebook for most places these days. If you're interested in an area in particular I've got a few I'd be willing to part with. For example, Clear Creek Canyon, Independence Pass, and maybe a few others. Just not my Eldo or Splatte guides, I'll be holding on to those...

For sport, unfortunately, you really have to get seperate guides for seperate areas. Most of the guide books that try to get all of the areas end up just being complete shit. I personally hate the Falcon Guide 'Rock Climbing Colorado'. Honestly, the route section here on MP is better than that book. Figure out where you are going to climb more and buy that guide. Then, slowly build up your library.

For sport in Boulder Canyon and Clear Creek I like the Rolofson guides. I find the topo format really informative. Mabe's guide to Clear Creek is also excellent, although pictorially based. I'm not as fond of the D'Antonio Boulder Canyon guide. The photos are often excellent, but there seem to be more errors than in the other guides. It is more up to date. The MP database alone can get you to many places. Nevertheless, keep climbing and you may end up with dozens of guidebooks!